786 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS IV. CONCLUSIONS A comparison of the morphological structure, chemical composition, diffusion of reagents, rate of reaction with various agents, and setting and supercontraction behavior reveals some significant differences between wool and hair the two hair types, Caucasian and Negro, ap- pear very similar in all the features examined. In acid binding and moisture regain, all the fibers are similar. The fiber mechanical properties exhibit considerable variations even within a fiber type. The slower rate of diffusion of reagents into hair and its greater re- sistance to chemical modification are due to structural differences at both the morphological and molecular level specifically, the important factors are the thicker cuticle and the more extensive covalent cross- linking of the hair keratin. ACKNOWLEDGMENT This study forms part of the basic research program of The Toni Co. (Received April 22, 1966) REFERENCES (1) Speakman, J. B., and Coke, C. E., J. Soc. Dyers Col., 54, 563 (1938). (2) Danforth, C. H., Nat. History, 26, 75 (1926) idem., Physiological Rev., 19, 94 (1939). (3) Kolar, G. G. and Parker, P., Chapter 25 in Sagarin, E., Cosmetics, Science and Tech- nology, Interscience, New York, 1957. (4) Steggerda, M., and Seibert, H. C., J. Heredity, 32, 315 (1941). (5) Trotter, M., Am..[. Phys. Anthrop., 14,433 (1930). (6) Rudall, K. M., Proc. Leeds. Phil. Soc., 4, Part I, 13 (1941). (7) Speakman, J. B., and Smith, S. G., J. Soc. Dyers Col., 52, 121 (1936). (8) Speakman, J. B., J. Soc. Chem. Ind., 50, 1 (1931). (9) Mercer, E. H., Text. Res..[., 23,388 (1953). (10) Dusenbury, J. H., and Menkart, J., Proc. Intl. Wool Text. Res. Conf., 1955, F142 Dusenbury, J. H., and Jeffries, E. B., J. Soc. Cosmetic Chemists, 6, 355 (1955). (11) Mercer, E. H., Text. Res..[., 24, 39 (1954). (12) Fraser, R. D. B., and Rogers, G. E., Austr..[. Biol. Sci., 8,288 (1955) Fraser, R. D. B., and MacRae, T. P., Text. Res..[., 26, 618 (1956). (13) Menkart, J., and Coe, A. B., Text. Res..[., 28, 218 (1958). (14) Rogers, G. E., Ann. N.Y. Acad. Sci., 83,378 (1959) Fraser, R. D. B., MacRae, T. P.. and Rogers, G. E., Nature, 183, 592 (1959) idem., .[. Text. Inst., 51, T497 (1960). (15) Geiger, W. B., Text. Res..[., 14, 82 (1944). (16) Bradbury, J. H., and Chapman, G. V., Austr..[. Biol. Sci., 4, 17 (1964). (17) Crewther, W. G., Fraser, R. D. B., Lennox, F. G., and Lindley, H., Adv. Protein Chem., 20, 191 (196,5). (18) Speakman, J. B. and Elliott, G. H., Symposium on Fibrous Proteins, 116 (Soc. Dyers Col., Leeds, 1946). (19) Speakman, J. B., Trans. Faraday Soc., 26, 92 (1929) J. Soc. Chem. Ind., 49, 209T (1930).
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